glacial epoch or episode

См. также в других словарях:

• glacial stage — ▪ geologic time       in geology, a cold episode during an ice age, or glacial period. An ice age (q.v.) is a portion of geologic time during which a much larger part of the Earth s surface was covered by glaciers than at present. The Pleistocene …   Universalium

• Saale Glacial Stage — ▪ geology       division of Pleistocene deposits and time in northern Europe (the Pleistocene Epoch began about 1,600,000 years ago and ended about 10,000 years ago). The Saale Glacial Stage followed the Holstein Interglacial Stage and preceded… …   Universalium

• Nebraskan Glacial Stage — ▪ geology       major division of Pleistocene time and deposits in North America (the Pleistocene Epoch occurred from 1,600,000 to 10,000 years ago). The Nebraskan Glacial Stage is the oldest generally recognized Pleistocene episode of widespread …   Universalium

• global warming — an increase in the earth s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. [1975 80] * * * Potential increase in global average surface temperatures resulting from… …   Universalium

• ice age — noun any period of time during which glaciers covered a large part of the earth s surface the most recent ice age was during the Pleistocene • Syn: ↑glacial period, ↑glacial epoch • Hypernyms: ↑period, ↑geological period • …   Useful english dictionary

• Snowball Earth — The Snowball Earth hypothesis as it was originally proposedcite book author = Kirschvink, J.L. year = 1992 chapter = Late Proterozoic low latitude global glaciation: The snowball Earth title = The Proterozoic Biosphere: A Multidisciplinary Study… …   Wikipedia

• Global cooling — in general can refer to an overall cooling of the Earth. In this article it refers primarily to a conjecture during the 1970s of imminent cooling of the Earth s surface and atmosphere along with a posited commencement of glaciation. This… …   Wikipedia

• North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …   Universalium

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

• Africa — /af ri keuh/, n. 1. a continent S of Europe and between the Atlantic and Indian oceans. 551,000,000; ab. 11,700,000 sq. mi. (30,303,000 sq. km). adj. 2. African. * * * I Second largest continent on Earth. It is bounded by the Mediterranean Sea,… …   Universalium

• river — river1 riverless, adj. riverlike, adj. /riv euhr/, n. 1. a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels. 2. a similar stream of something other than water: a… …   Universalium